This has really gotten me stumped. What process could be eating up all 8GB of my RAM? You can see a screenshot of both task manager and resource monitor but the figures don't seem to add up.

The issue seems to start when playing Battlefield 3 for a while but turning it off doesn't change anything. Could this be some memory leak? If so, how can I determine what exactly is eating all of my RAM up?

I have seen this with mine where it did this. I have Win8 installed as the only os on my MBP and it turned out that the trackpad driver was stuck and was eating ram. Once I installed the trackpad++ program it resolved itself. Maybe it's a driver issue?

I may be way off target but perhaps this will at least get you to a point whereby you can start to identify the problem.

Thanks, I found these links as well. I did try installing the latest AMD beta drivers but that didn't change anything. Well, unfortunately the tag was MINI and that gave me a gigantic, unscrollable list in Command Prompt. I was able to catch a note towards my LAN driver and apparently there was a newer version available at manufacturer's website (Qualcomm's Atheros line, god is their site awful for finding drivers). Installed it and so far seems good *knock on wood*. I hope that was the reason for the memory leak.